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云南锡矿井下存在着氡,而氡是产生矿工肺癌的主要因素之一,因此通风排氡成为我矿一项迫切需要解决的严重问题。云锡井下作业场所氡污染的主要来源是:采空区积累的高浓度氡的漏入;自然下行风把上部采空区及矿岩裂隙内的高浓度氡的带入;氡从矿岩介质中的渗出。因而形成高浓度氡对井下矿工的危害。针对上述原因,选用了压入式通风,使井巷内气压高于地表气压,以减少氡的漏入、渗出和改变下行风的方向,取得了降氡的良好的效果。此外,在防氡密闭工艺方面,对井巷壁喷涂混凝土防氡复盖层和密闭墙采用水泥砂浆粉面,效果良好。
There is radon in Yunnan tin mine, and radon is one of the main factors that cause miners’ lung cancer. Therefore, ventilation and radon discharge have become a serious problem that needs urgent solution in our mine. The main sources of radon pollution in the underground workplace of Yun-tin are: the leakage of high-concentration radon accumulated in the goaf; the natural descending winds bring in the high-concentration radon in the upper goaf and the fractures in the ore rock; Exudation in the medium. Thus the formation of high concentrations of radon hazards miners underground. For the above reasons, the selection of the pressure ventilation, so that Lane gas pressure above the surface air pressure in order to reduce the leakage of radon, seepage and change the direction of the downwind, and achieved a good effect of radon reduction. In addition, in the process of anti-radon airtightness, cement mortar noodles are used to spray the concrete radon overlay on the shaft wall and the confinement wall, and the effect is good.